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AG31-004 - School HVAC Design Manual by McQuay

By McQuay

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Concrete house keeping pads are common but expensive. In addition, the higher the pad, the heavier it will be. Consider using high base rails supplied with the air-handling unit to get the necessary trapping height. VAV systems require special attention. The fans must be selected with enough turndown to meet the requirements of the design and still offer stable operation. Acoustics is also an issue. Careful selection of the fans can greatly reduce the sound energy. Any savings found selecting forward curved fans over airfoil fans could be lost when the additional acoustics treatments are included.

M. and the total required supply air is 6,000 cfm. The actual connected load is 6 times 1200 cfm or 7,200 cfm. The air-handling unit should be selected and the ductwork designed for 6,000 cfm with a diversity of 83%. It is not an uncommon practice to “default” to a minimum cfm/ft2 and design the air system based on this airflow while applying diversity to the cooling plant (chiller) size. This practice should be discouraged, as it will result in an oversized air handler and ducting. Even worse, the cooling load calculated from the air handling unit psychrometrics and the cooling load from the load estimation won’t match.

The system can transfer 385 mbh at -5°F. At 32°F ambient, the run around loop transfers 214 mbh. In most cases a three-way valve is required during cold weather as frost control. When the exhaust air temperature approaches 32°F, some fluid is bypassed around the outdoor air coil to avoid freezing the exhaust air coils. Another key design issue is the exhaust air coils will usually form condensate. They are “cooling coils” and as such require a drain pan piped to Application Guide AG 31-004 35 drain.

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